Method for supporting coexistence considering while subchannel allocation in a broadband wireless access system

ABSTRACT

A method for supporting coexistence in a mobile station configured for supporting a coexistence mode of a primary wireless communication system and a secondary wireless communication system. The method comprises transmitting to a base station, via the mobile station, a registration request (REG-REQ) message comprising coexistence capability information, receiving a registration response (REG-RSP) message comprising information about support of the coexistence mode in response to the REG-REQ message, and transmitting to the base station, via the mobile station, a sleep mode request (MOB_SLP-REQ) message comprising first coexistence information for requesting a band adaptive modulation and coding (AMC) for adjacent subcarrier permutation.

This application is a continuation of U.S. patent application Ser. No.12/392,455, filed on Feb. 25, 2009, now U.S. Pat. No. 8,116,319, whichclaims the benefit of earlier filing date and right of priority toKorean Application No. 10-2008-0060333, filed on Jun. 25, 2008, and alsoclaims the benefit of U.S. Provisional Application Ser. Nos. 61/033,797,filed Mar. 5, 2008 and 61/031,015, filed on Feb. 25, 2008, the contentsof which are all hereby incorporated by reference herein in theirentirety.

BACKGROUND OF THE INVENTION

1. Field of the Invention

The present invention relates to the support of multi-radio coexistencein a mobile station using a broadband wireless access system, and moreparticularly, to a method for improving throughput of a broadbandwireless access system and another wireless communication system.

2. Discussion of the Related Art

In a broadband wireless access system based on the IEEE 802.16e system,a sleep mode for minimizing power consumption of a mobile station issupported. The mobile station requests a base station to transition to asleep mode via a sleep mode request (MOB_SLP-REQ) message if downlinktraffic is not present during a predetermined time. Accordingly, thebase station allows the sleep mode entry of the mobile station via asleep mode response (MOB_SLP-RSP) message.

In the sleep mode, the operation of the mobile station is performed bythe repetition of a sleep interval and a listening interval. In thelistening interval, the IEEE 802.16e system is used, and, in the sleepinterval, the use of other wireless communication such as Bluetooth orWiFi is allowed to provide coexistence of a time sharing scheme.

However, the total throughput of the time sharing scheme cannot exceed1, and throughput deterioration may occur due to the interruption of atransmission or reception operation which has been performed, that is,fragmentation, in a time boundary.

SUMMARY OF THE INVENTION

Accordingly, the present invention is directed to a method forsupporting coexistence while considering subchannel allocation in abroadband wireless access system that substantially obviates one or moreproblems due to limitations and disadvantages of the related art.

An object of the present invention is to provide a method for supportingcoexistence while considering subchannel allocation in a broadbandwireless access system, which is capable of simultaneously using awireless wide area network (WWAN) communication and a wireless personalarea network/wireless local area network (WPAN/WLAN) communication and,as a result, improving coexistence throughput.

Another object of the present invention is to provide a method forsupporting coexistence while considering subchannel allocation in abroadband wireless access system, which is capable of supportingwireless communications which coexist by a method such as adjacentsubcarrier permutation with respect to a mobile station, to which amethod for supporting coexistence while considering subchannelallocation is applied.

Additional advantages, objects, and features of the invention will beset forth in part in the description which follows and in part willbecome apparent to those having ordinary skill in the art uponexamination of the following or may be learned from practice of theinvention. The objectives and other advantages of the invention may berealized and attained by the structure particularly pointed out in thewritten description and claims hereof as well as the appended drawings.

To achieve these objects and other advantages and in accordance with thepurpose of the invention, as embodied and broadly described herein, amethod for supporting coexistence while considering subchannelallocation includes requesting a band adaptive modulation and coding(AMC) for adjacent subcarrier permutation to a base station bytransmitting first coexistence information, after the secondary wirelesscommunication is turned on, and requesting a release of the adjacentsubcarrier permutation to the base station by transmitting secondcoexistence information, if the secondary wireless communication systemis turned off.

The adjacent subcarrier permutation may allocate subcarriers of any oneof an uppermost frequency band or a lowermost frequency band to themobile station according to a bit value of the first coexistenceinformation.

The first coexistence information indicating the band AMC allocation maybe transmitted to the base station via a sleep mode request(MOB_SLP-REQ) message.

The requesting the release of the adjacent subcarrier permutation mayincludes, at the mobile station, transmitting a sleep mode request(MOB_SLP-REQ) message including third coexistence information forrequesting partial usage subchannel (PUSC) allocation to the mobilestation to the base station.

The requesting the band AMC may includes, at the mobile station,transmitting a report response (REP-RSP) message for requesting band AMCallocation to the mobile station to the base station.

The requesting the release of the adjacent subcarrier permutation mayincludes, at the mobile station, transmitting a report response(REP-RSP) message indicating partial usage subchannel (PUSC) allocationto the mobile station to the base station.

The requesting the band AMC may be performed in a WiMAX active period.

In another aspect of the present invention, a method for supportingcoexistence while considering subchannel allocation includes, at themobile station, transmitting a registration request (REG-REQ) messageincluding coexistence capability information to a base station;receiving a registration response (REG-RSP) message comprisinginformation about the support of the coexistence mode in response to theregistration request (REG-REQ) message; turning on the second wirelesscommunication system; requesting a band adaptive modulation and coding(AMC) for adjacent subcarrier permutation to a base station bytransmitting first coexistence information; and requesting a release ofthe adjacent subcarrier permutation to the base station by transmittingsecond coexistence information, if the secondary wireless communicationsystem is turned off. The secondary wireless communication may beBluetooth wireless communication.

In another aspect of the present invention, a method for supportingcoexistence operation while considering subchannel allocation includes,when coexistence information for requesting a band adaptive modulationand coding (AMC) is received from the mobile station, allocating asubchannel of an adjacent channel band to the mobile station; and, whencoexistence information for requesting the release of adjacentsubcarrier permutation is received from the mobile station, allocating apartial usage subchannel (PUSC) to the mobile station.

The allocating of the band AMC to the mobile station may includeallocating subcarriers of any one of an uppermost frequency band or alowermost frequency band to the mobile station according to a bit valueof the coexistence information.

The coexistence information may be received via a sleep mode request(MOB_SLP-REQ) message.

The coexistence information may be received via a report response(REP-RSP) message.

Although IEEE 802.16e, that is, WiMAX, is described as an example of abroadband wireless access system in the embodiments of the presentinvention, a method for supporting coexistence while consideringsubchannel allocation according to the embodiments of the presentinvention is applicable every broadband wireless access system.

According to the embodiments of the present invention, it is possible toprovide simultaneity of different wireless communications when a sleepmode is used and improve simultaneity of different wirelesscommunications even when the sleep mode is not used.

It is to be understood that both the foregoing general description andthe following detailed description of the present invention areexemplary and explanatory and are intended to provide furtherexplanation of the invention as claimed.

BRIEF DESCRIPTION OF THE DRAWINGS

The accompanying drawings, which are included to provide a furtherunderstanding of the invention and are incorporated in and constitute apart of this application, illustrate embodiment(s) of the invention andtogether with the description serve to explain the principle of theinvention. In the drawings:

FIG. 1 is a view showing an example of a coexistence method of WiMAX andBluetooth;

FIG. 2 is a signal flow diagram showing a method for supportingexistence while considering subchannel allocation according to anembodiment of the present invention;

FIG. 3 is a signal flow diagram showing a method for supportingexistence while considering subchannel allocation according to anotherembodiment of the present invention;

FIG. 4 is a signal flow diagram showing a method for supportingexistence while considering subchannel allocation according to anotherembodiment of the present invention; and

FIG. 5 is a signal flow diagram showing a method for supportingexistence while considering subchannel allocation according to anotherembodiment of the present invention.

DETAILED DESCRIPTION OF THE INVENTION

Reference will now be made in detail to the preferred embodiments of thepresent invention, examples of which are illustrated in the accompanyingdrawings. However, the embodiments of the present invention may bevariously modified and the range of the present invention is not limitedto the following embodiments.

The following embodiments are proposed by combining constituentcomponents and characteristics of the present invention according to apredetermined format. The individual constituent components orcharacteristics should be considered to be optional factors on thecondition that there is no additional remark. If required, theindividual constituent components or characteristics may not be combinedwith other components or characteristics. Also, some constituentcomponents and/or characteristics may be combined to implement theembodiments of the present invention. The order of operations to bedisclosed in the embodiments of the present invention may be changed toanother. Some components or characteristics of any embodiment may alsobe included in other embodiments, or may be replaced with those of theother embodiments as necessary.

The specific terms used in the following description are provided forfacilitating the understanding of the present invention, and the use ofthe specific terms may be variously changed without departing from thetechnical scope of the present invention.

The above-mentioned embodiments of the present invention are disclosedon the basis of a data communication relationship between a base stationand a mobile station. In this case, the base station is used as aterminal node of a network via which the base station can directlycommunicate with the mobile station. Specific operations to be conductedby the base station in the present invention may also be conducted by anupper node of the base station as necessary.

In other words, it will be obvious to those skilled in the art thatvarious operations for enabling the base station to communicate with themobile station in a network composed of several network nodes includingthe base station will be conducted by the base station or other networknodes other than the base station. The term “Base Station” may bereplaced with a fixed station, Node-B, eNode-B (eNB), or an access pointas necessary. The term “mobile station” may also be replaced with anuser equipment (UE), a mobile station (MS) or a mobile subscriberstation (MSS) as necessary.

The following embodiments of the present invention can be implemented bya variety of means, for example, hardware, firmware, software, or acombination of them.

In the case of implementing the present invention by hardware, thepresent invention can be implemented with application specificintegrated circuits (ASICs), Digital signal processors (DSPs), digitalsignal processing devices (DSPDs), programmable logic devices (PLDs),field programmable gate arrays (FPGAs), a processor, a controller, amicrocontroller, a microprocessor, etc.

If operations or functions of the present invention are implemented byfirmware or software, the present invention can be implemented in theform of a variety of formats, for example, modules, procedures,functions, etc. The software codes may be stored in a memory unit sothat it can be driven by a processor. The memory unit is located insideor outside of the processor, so that it can communicate with theaforementioned processor via a variety of well-known parts.

FIG. 1 is a view showing an example of a coexistence method of WiMAX andBluetooth.

WiMAX frames may be grouped into an active period and an inactiveperiod. The inactive period may be a sleep period of a sleep modedefined in the IEEE 802.16e standard or a scanning period.

In the embodiments of the present invention, there is no limitation in adetailed method for implementing the inactive period. Generally, aperiod which is an inactive state for turning off WiMAX wirelesscommunication is called an inactive period. The length of the inactiveperiod may be 0. In the inactive period, other coexisting wirelesscommunication such as WiFi, Bluetooth or the like may be used instead ofWiMAX.

The WiFi, Bluetooth or the like may coexist with primary wirelesscommunication such as WiMAX or the like in the inactive period by a timesharing scheme. In the active period, the primary wireless communicationmay be turned on to transmit or receive data.

Unlike the prior art, in order to simultaneously use the primarywireless communication and secondary wireless communication such asBluetooth in the inactive period, in the embodiments of the presentinvention, a method for performing the primary wireless communicationsuch as WiMAX using a subcarrier having low interference with the secondcommunication such as Bluetooth is provided.

An adaptive modulation & coding (AMC) scheme refers to a datatransmission scheme for setting different modulation schemes and codingschemes of data channels according to a channel status of a cell, thatis, a channel status between a base station and a mobile station, so asto improve use efficiency of the whole cell. Such an AMC scheme has aplurality of modulation schemes and a plurality of coding schemes andmodulates and codes data channel signals by combining the modulationschemes and the coding schemes. Generally, each of combinations of themodulation schemes and the coding schemes is called a modulation andcoding scheme (MCS), and a plurality of MCSs may be defined from a level1 to a level N according to the number of MCSs. That is, the AMC schemeadaptively sets the level of the MCS according to the channel statusbetween the mobile station and the base station, which are currentlybeing connected, to improve whole system efficiency.

In order to increase a data transfer rate, in a portable Internet, aband AMC for relatively distinguishing between a good channel and a badchannel and allocating subchannels in a range allowed by a resource tomobile stations in consideration of the statuses of the subchannels isused. If the band AMC is applied, a mobile station to which a resourceincluding good channels is allocated can perform high-speed datatransmission, by modulating a signal to have a high capacity.

In the band AMC, an access terminal (AT) which is the mobile stationmeasures channel quality information (CQI), collects channel informationof subchannels which is being used, and uses a band including goodsubchannels on the basis of the channel information. Thus, influence dueto peripheral noise and interference is reduced and thus the mobilestation using the band AMC can increase a coding rate and transmit asignal at a relatively high transfer rate.

In the embodiments of the present invention, in order to supportcoexistence of primary wireless communication system such as WiMAX andsecondary wireless communication system such as WiFi and Bluetooth, theband AMC is used.

A mobile station requests a base station to use adjacent subcarrierpermutation upon uplink allocation. In addition, the mobile station mayrequest the base station to use adjacent subcarrier permutation evenupon downlink allocation, and, at this time, the same procedure as uponthe uplink allocation may be performed. Although, hereinafter, only theuplink allocation is described, the technical range of the presentinvention is not limited to this.

As a method for making a request for adjacent subcarrier permutation,various methods may be used.

First, if an inactive period is implemented as a sleep period, a mobilestation may transmit a sleep mode request (MOB_SLP-REQ) message to abase station and inform the base station that the mobile station entersthe sleep mode for coexistence. The sleep mode request (MOB_SLP-REQ)message includes coexistence information. The coexistence informationindicates that the mobile station makes a request for adjacentsubcarrier permutation, for coexistence. A message to which thecoexistence information is applied may be a sleep mode request(MOB_SLP-REQ) message, a sleep mode response (MOB_SLP-RSP) message orthe like, if the inactive period is implemented as the sleep period. Ifthe inactive period is implemented by another scheme or the inactiveperiod is not presented, the coexistence information may be applied toany messages.

The base station which receives the coexistence information informs themobile station that bits are set in a sleep mode response (MOB_SLP-RSP)message and subcarriers separated as far as possible from WLAN and WPANhaving a 2.4-GHz ISM band are applied to uplink allocation uponscheduling.

Table 1 shows an example of the coexistence information (e.g. acoexistence bit) included in the sleep mode messages (e.g. MOB_SLP-REQor MOB_SLP-RSP).

TABLE 1 Type Length Value Scope TBD 1 Bit #0: co-located coexistenceMOB_SLP-REQ, mode 1 MOB_SLP-RSP Bit #1: co-located coexistence mode 2Bit #2: sleep mode follows the MAP relevance for co-located coexistence.Bit #3: Uplink band AMC for co-located coexistence. Bit #4: Indicateband AMC subchannel allocation. 0b0: Subchannel shall be to thelowermost frequencies. 0b1: Subchannel shall be to the uppermostfrequencies. Bits #5~#7: reserved

Referring to the table 1, the bit #0 and the bit #1 of coexistenceinformation represent a co-located coexistence mode type, the bit #2indicates the sleep mode follows the MAP relevance for co-locatedcoexistence, and the bit #3 indicates uplink band AMC mode forco-located coexistence. Also, if bit #4 of coexistence information isset to 0, the subchannel is allocated to lowermost frequencies, or thebit #4 is set to 1, the subchannel is allocated to uppermostfrequencies.

As another method for making a request for adjacent subcarrierpermutation, one bit may be added to a report response (REP-RSP) messageand be informed to the base station. That is, if wireless communicationsuch as Bluetooth is turned on and a coexistence resource is necessary,the mobile station transmits a report response (REP-RSP) message in anunsolicited state.

At this time, in a parameter included in the report response (REP-RSP)message, co-located WPAN/WLAN coexistence is represented in acoexistence bit (bit #4) or any reserved bit excluding a basic reportportion. The base station which receives the report response (REP-RSP)message confirms that the allocation of specific subcarriers isrequested for the coexistence operation of the mobile station andperforms scheduling on the basis of the confirmed result.

Table 2 shows an example of the coexistence bit (e.g. bit #4) includedin the report response (REP-RSP) message.

TABLE 2 REP-REQ Report type Name Type Length Value Bit #0 = 1 Basic 1.41 Bit #0; WirelessHUMAN detected report on the channel. Bit #1; Unknowntransmissions detected on the channel. Bit #2; Specific spectrum userdetected on the channel. Bit #3; Unmeasured. Channel not measured. Bit#4; Co-located WPAN/WLAN coexistence. Bits #5-7; reserved

If the mobile station exits from the sleep mode after turning off thewireless communication system such as WLAN, WPAN or the like, or if themobile station makes a request for the movement from an AMC zone to apartial usage subchannel (PUSC) zone, the base station returns toprevious distributed subcarrier permutation.

FIG. 2 is a signal flow diagram showing a method for supportingexistence while considering subchannel allocation according to anembodiment of the present invention.

When a mobile station uses the coexisting wireless communication byturning on Bluetooth (220), the mobile station transmits coexistenceinformation (e.g. coexistence TLV) to a base station via a medium accesscontrol (MAC) message and makes a request for adjacent subcarrierpermutation (e.g. adjacent subcarrier permutation=1) (230). Even whenthe other wireless communication system excluding Bluetooth is used asthe secondary wireless communication system, the following process isequally performed.

The base station which receives the coexistence information transmits aresponse (e.g. coexistence TLV) to the coexistence information to themobile station (240).

In addition, the base station uses the AMC when performing uplink and/ordownlink allocation to the mobile station (250).

When the mobile station does not use the coexisting wirelesscommunication by turning off Bluetooth (260), the mobile stationtransmits the coexistence information (e.g. coexistence TLV) to the basestation via the MAC message and makes a request for the release of theadjacent subcarrier permutation (270).

When the base station confirms that the coexistence resource is notnecessary from the coexistence information, the base station transmits aresponse (e.g. coexistence TLV) to the coexistence information to themobile station (280), and a previous permutation scheme is returned(290). In FIG. 2, since the previous permutation scheme is the PUSC, thePUSC is allocated to the mobile station.

The mobile station may perform the following procedure in order toperform handover while the coexisting wireless communication is used.

First, if the inactive period is implemented using the sleep mode, therelease of the sleep mode is requested and the use of the coexistingwireless communication is stopped. For example, a coexisting wirelesscommunication chip is informed of the stop of the use of the wirelesscommunication via firmware in software or a coexisting wirelesscommunication chip is informed of the stop of the use of the wirelesscommunication via a wire in hardware.

If the sleep mode is not used, the use of the coexisting wirelesscommunication in the mobile station may be simply stopped. Similarly,this process may be performed via firmware in software or in hardware.After handover, the mobile station transmits the coexistence informationor the report response (REP-RSP) message to a new base station and makesa request for the support of coexistence.

FIG. 3 is a signal flow diagram showing a method for supportingexistence while considering subchannel allocation according to anotherembodiment of the present invention.

When a mobile station uses coexisting wireless communication by turningon Bluetooth (320), the mobile station makes a request for the supportof coexistence to a base station via a report response (REP-RSP) messagecomprising coexistence information (330). The coexistence information isincluded in the report response (REP-RSP) message in the form of aco-located WPAN/WLAN coexistence field. In FIG. 3, if the co-locatedWPAN/WLAN coexistence field is set to 1, it is indicated that theadjacent subcarrier permutation is requested and, if the co-locatedWPAN/WLAN coexistence field is set to 0, it is indicated that therequest for the adjacent subcarrier permutation is released. Even whenthe other wireless communication system excluding Bluetooth is used asthe secondary wireless communication system, the following process isequally performed.

The base station which receives the report response (REP-RSP) messageuses the AMC when performing uplink and/or downlink allocation to themobile station (350).

When the mobile station does not use the coexisting wirelesscommunication by turning off Bluetooth (360), the mobile stationtransmits the coexistence information (e.g. co-located WPAN/WLANcoexistence field set to 0) to the base station via the report response(REP-RSP) message and makes a request for the release of the adjacentsubcarrier permutation (370).

When the base station confirms that the coexistence resource is notnecessary from the coexistence information, a previous permutationscheme is returned (390). In FIG. 3, since the previous permutationscheme is the PUSC, the PUSC is allocated to the mobile station.

FIG. 4 is a signal flow diagram showing a method for supportingexistence while considering subchannel allocation according to anotherembodiment of the present invention.

A mobile station may inform a base station of capability for supportingco-located coexistence for allowing different wireless communications tobe used in the same time zone. New information having a type lengthvalue (TLV) form, that is, coexistence capability information, is used.In addition, the base station may transmit the coexistence capabilityinformation to the mobile station and inform the mobile station that theco-located coexistence can be supported. As an example of a message fortransmitting the coexistence capability information (e.g. coexistencecapability TLV), a registration request (REG-REQ) message and aregistration response (REG-RSP) message may be used.

Table 3 shows an example of the coexistence capability information.

TABLE 3 Type Length Value Scope [TBD] 1 Bit #0: PSC-based co-locatedREG-REQ, coexistence mode 1 REG-RSP Bit #1: PSC-based co-locatedcoexistence mode 2 Bit #2: Sleep mode follows the MAP relevance forPSC-based co-located coexistence Bit #3; Uplink Band AMC for PSC-basedco-located coexistence. Bits # 4-7: reserved

Referring to table 3, the bit #0 and the bit #1 of coexistencecapability information represents a PSC-based co-located coexistencemode, the bit #2 indicates the sleep mode followed the MAP relevance forPSC-based co-located coexistence. Also, the bit #3 of coexistencecapability information indicates uplink band AMC mode for PSC-basedco-located coexistence.

In FIG. 4, the mobile station includes the coexistence capabilityinformation in a registration request (REG-REQ) message and transmitsthe REG-REQ message to the base station informing that the mobilestation can support the co-located coexistence in a registration process(411).

The base station informs the mobile station that the co-locatedcoexistence can be supported via the registration response (REG-RSP)message which includes the coexistence capability information (412).

When the mobile station uses coexisting wireless communication byturning on Bluetooth (420), the mobile station transmits coexistenceinformation comprising a coexistence TLV to the base station via an MACmessage and makes a request for adjacent subcarrier permutation (430).

The base station which receives the coexistence information transmits aresponse MAC message comprising the coexistence TLV in response to theMAC message to the mobile station (440). In addition, the base stationuses the AMC when performing uplink and/or downlink allocation to themobile station (450).

When the mobile station does not use the coexisting wirelesscommunication by turning off Bluetooth (460), the mobile stationtransmits the coexistence information to the base station via the MACmessage and makes a request for the release of the adjacent subcarrierpermutation (470).

When the base station confirms that the coexistence resource is notnecessary from the coexistence information, the base station transmits aresponse to the coexistence information to the mobile station (480), anda previous permutation scheme is returned (490).

FIG. 5 is a signal flow diagram showing a method for supportingexistence while considering subchannel allocation according to anotherembodiment of the present invention.

In FIG. 5, a mobile station includes coexistence capability information(e.g. coexistence capability TLV) in a registration request (REG-REQ)message and informs the base station that the mobile station can supportthe co-located coexistence in a registration process (511).

The base station transmits a registration response (REG-RSP) messagecomprising coexistence capability information which indicates theco-located coexistence can be supported to the mobile station (512).

When the mobile station uses coexisting wireless communication byturning on Bluetooth (520), the mobile station makes a request for thesupport of coexistence to the base station via the report response(REP-RSP) message (530).

The base station which receives the report response (REP-RSP) messageuses the AMC when performing uplink and/or downlink allocation to themobile station (550).

When the mobile station does not use the coexisting wirelesscommunication by turning off Bluetooth (560), the mobile stationtransmits the coexistence information to the base station via the reportresponse (REP-RSP) message and makes a request for the release of theadjacent subcarrier permutation (570).

When the base station confirms that the coexistence resource is notnecessary from the report response (REP-RSP) message, a previouspermutation scheme is returned (590).

Although the method for, at the mobile station, making a request for thesupport of the coexistence to the base station using a new bit of a bandAMC message and new information of the TLV form is described, the samecoexistence support method, that is, the coexistence support using theband AMC, may be requested by other information exchange methods.

According to the embodiments of the present invention, it is possible tosimultaneously use WWAN communication and WPAN/WLAN communication and,as a result, improve coexistence throughput, by adjusting subcarrierpermutation upon uplink and/or downlink transmission in a broadbandwireless system such as IEEE 802.16e.

According to the present invention, it is possible to simultaneously useWWAN communication such as IEEE 802.16e and WPAN/WLAN communication suchas Bluetooth or WiFi and improve coexistence throughput. The presentinvention is applicable to an apparatus such as a base station, a mobilestation or the like in a broadband wireless system.

It will be apparent to those skilled in the art that variousmodifications and variations can be made in the present inventionwithout departing from the spirit or scope of the invention. Thus, it isintended that the present invention covers the modifications andvariations of this invention provided they come within the scope of theappended claims and their equivalents.

What is claimed is:
 1. A method for supporting coexistence in a mobilestation configured for supporting a coexistence mode of a primarywireless communication system and a secondary wireless communicationsystem, the method performed by the mobile station and comprising:transmitting a sleep mode request (MOB_SLP-REQ) message to a basestation, the MOB_SLP-REQ message requesting an initiation of a sleepmode and comprising first coexistence information for requesting anallocation of a band adaptive modulation and coding (AMC) for adjacentsubcarrier permutation during the sleep mode; and receiving a sleep moderesponse (MOB_SLP-RSP) message from the base station in response to theMOB_SLP-REQ message, the MOB_SLP-RSP message comprising secondcoexistence information for allocating band AMC subchannels to themobile station, wherein the band AMC subchannels of an uppermostfrequency band are allocated to the mobile station during the sleep modeof the primary wireless communication system supporting the coexistencemode.
 2. The method of claim 1, wherein subchannels of the uppermostfrequency band or a lowermost frequency band are allocated to the mobilestation for the adjacent subcarrier permutation based on a bit value ofthe first coexistence information.
 3. The method of claim 1, furthercomprising requesting release of the adjacent subcarrier permutation bytransmitting a MOB_SLP-REQ message comprising third coexistenceinformation for requesting partial usage subchannel (PUSC) allocation tothe mobile station.
 4. The method of claim 3, wherein the primarywireless communication system is a WiMAX system and the transmission ofthe second MOB_SLP-REQ message comprising the third coexistenceinformation is performed in a WiMAX active period.
 5. The method ofclaim 1, further comprising: transmitting a registration request(REG-REQ) message to the base station before transmitting theMOB_SLP-REQ message, the REG-REQ message comprising first coexistencecapability information which indicates that the mobile station cansupport the coexistence mode; and receiving a registration response(REG-RSP) message in response to the REG-REQ message, the REG-RSPmessage comprising second coexistence capability information whichindicates that the base station can support the coexistence mode.
 6. Amethod for supporting a coexistence operation of a mobile stationconfigured for supporting a coexistence mode of a primary wirelesscommunication system and a secondary wireless communication system, themethod performed by a base station and comprising: receiving a sleepmode request (MOB_SLP-REQ) message from the mobile station, theMOB_SLP-REQ message requesting an initiation of a sleep mode andcomprising first coexistence information for requesting an allocation ofa band adaptive modulation and coding (AMC) for adjacent subcarrierpermutation during the sleep mode; transmitting a sleep mode response(MOB_SLP-RSP) message in response to the MOB_SLP-REQ message to themobile station, the MOB_SLP-RSP message comprising second coexistenceinformation for allocating band AMC subchannels to the mobile station;and allocating the band AMC subchannels to the mobile station, whereinthe band AMC subchannels of an uppermost frequency band are allocated tothe mobile station during the sleep mode of the primary wirelesscommunication system supporting the coexistence mode.
 7. The method ofclaim 6, wherein allocating the subchannel comprises allocatingsubcarriers of the uppermost frequency band or a lowermost frequencyband to the mobile station based on a bit value of the first coexistenceinformation.
 8. The method of claim 6, further comprising: receiving aMOB_SLP-REQ message comprising third coexistence information forrequesting partial usage subcarrier (PUSC) allocation; and releasing theadjacent subcarrier permutation.
 9. The method of claim 8, wherein theprimary wireless communication system is a WiMAX system and thereception of the second MOB_SLP-REQ message comprising the thirdcoexistence information is performed in a WiMAX active period.
 10. Themethod of claim 6, further comprising: receiving a registration request(REG-REQ) message from the mobile station before receiving theMOB_SLP-REQ message, the REG-REQ message comprising first coexistencecapability information which indicates that the mobile station cansupport the coexistence mode; and transmitting a registration response(REG-RSP) message in response to the REG-REQ message, the REG-RSPmessage comprising second coexistence capability information whichindicates that the base station can support the coexistence mode.